CLAS Physics Database

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Measurement E151M13

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Experiment: EG4, 2016

Spokespersons: Xiaochao Zheng

Experiment comment: Final asymmetry results for the ep-> e pi+ (n) channel extracted from CLAS/EG4 data obtained using a longitudinally polarized beam and a longitudinally polarized NH3 target (CAA HS07-02).

No publications available for this experiment

Quantity measured: A_UL,
Target spin asymmetry.
Beam: e, polarization: longitudinal
Target: p (Z=1, A=1), polarization: longitudinal
Final state: π⁺n, polarization: none

Q² :	0.0707 GeV²
W :	1205 GeV
ε :	0.8863
E_beam :	1.0539 GeV
ε_L:	0.5351

Select data slice:
cos(θ_π⁺) =

Observable quantity measured (Y axis): A_UL,
Plot measurement data

Parameter (X axis): φ(π⁺), degrees

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Measured data:

cos(θ_π⁺)	φ(π⁺), degrees	A_UL	Data errors	Systematic errors
0.35	294	-0.7818	0.4074	0.0939
0.45	270	0.0279	0.5063	0.0302
0.45	282	-0.0587	0.3743	0.0307
0.45	294	-0.2078	0.4428	0.0382
0.55	270	-0.1552	0.3614	0.0348
0.55	282	-0.272	0.3313	0.0431
0.65	258	0.3443	0.4419	0.0493
0.65	270	0.252	0.4063	0.0415
0.65	282	-0.1865	0.3399	0.0367
0.75	258	0.1716	0.441	0.0358
0.75	270	-0.5207	0.3424	0.0664
0.75	282	0.2202	0.4433	0.0391
0.85	150	0.4026	0.376	0.0548
0.85	162	-0.0899	0.3533	0.0317
0.85	174	0.6127	0.3761	0.0759
0.85	186	0.239	0.3748	0.0405
0.85	198	-0.0939	0.3754	0.0318
0.85	210	-0.5279	0.3284	0.0671
0.85	222	-0.0132	0.3962	0.03
0.95	138	-0.3732	0.287	0.052
0.95	150	0.1456	0.3217	0.0343
0.95	162	0.3857	0.3575	0.0532
0.95	174	-0.2204	0.3367	0.0391
0.95	186	-0.2677	0.2664	0.0428
0.95	198	-0.5735	0.3056	0.0718
0.95	210	-0.2701	0.3266	0.0429